Sleeve for bag valves



March 25, 1952 v H., PETERS p -rAL 2,590,568

SLEEVE: FOR BAG VALVES' Filed May l7"19 49 /4 IN VEN TORS f\ #meer Pfff/@s CZ .V05 P/fea/V Patented Mar. 25, 1952 SLEEVE FOR BAG VALVES Harry Peters and Clyde D. Pierson, Middletown, l Ohio, assignors `to The Raymond Bag Company,

Middletown, Ohio, a corporation of Ohio Application May k27, 1949, Serial N o. 95,738

2 Claims.

' This. invention relatesto a sleeve for a bag valve,` and more particularly to a sleeve adapted to be inserted in a preformed valve by a mechanical inserter, such as that shown in Patent 2,442,431 granted to us on June l, 1948.

As is well known it is common practice to provide bags or sacks for certain purposes with valves, which are usually-formed by folding a corner of the bag at one end thereof inwardly between the sidewalls of the bag. Such bags are usually formed of heavy paper or like material and often comprise a plurality of plies or bag-walls.. After the corner has been folded in the end of the bag is closed by sewing the ends of the side walls one to the other. The line of stitching extends through the outer edges of thefolded valve so as to close the same except fora filling opening adapted to receive the filling spout of a bag filling machine. When the bag has been filled the material within the -bag crushes the inner end of the valve against the end of lthe bag and thus closes the filling finematerials with a sleeve of soft material which extends inwardly beyond the end of the valve and due to its softness can be very completely 'crushed into contact with the end of the .bag andthus completelyseal the filling opening.

Such a sleeve' mayv Vtake various forms vbut usuallyitcomprises a sheet of paper', or other vsuitable sleeve Iforming material, the end 'portions of which are folded one on the other and after one end of the folded sleeve has been inserted in the valve the edge portions of the sleeve `are sewed into the closing seam of the valve so that the folded sleeve becomes tubular in form. However. it is important that the sleeve be slit along the fold line so as to disconnectv the lower portions of the sleeve one from the other and permit them to fold tightly one against the other and against the end of the bag. For 'this purpose a sleeve of this type isv usually slitl along the fold line from a pointl adjacent the inner end of the valve through the inner end of the sleeve. When the sleeve is to be inserted by hand the slitting thereof is not objectionable but a sleeve which is slit in this manner Acannot,be'mechanically inserted by a mechanism similar tothat shown in the above mentioned patent, because the inserting element would have contact with only a narrow portion of the section of material adjacent one end thereof `andas a result the sleeve could not'be engaged and supported by the inserting element `in the manner necessary for the proper folding and inserting thereof.

The main object of the present invention is to provide a slit sleeve of such a character that it can be firmly engaged by and supported on the inserting element'during the folding and inserting operations, and that lthe inner portions of the sleeve be separated at the foldline after :the sleeve has been inserted. "A'further object ofthe invention is to provide such a sleeve which can be produced and inserted at a cost much lower than the cost of .other slit sleeves, and which will have all the 'advantages off such other sleeves.

'Otherl objects of the invention may appear as the sleeve is described in detail. n In the laccompanying drawings Fig. 1 is a side elevation of the `valve corner vof a bag; Fig. 2 vis a similar view with a portion of one side wall of the bag bent voutwardly to show the valve and the sleeve; Fig-Bis a plan `view of the outer side of a sleeve embodying the intion.

1 InFigures 1 and 2 of 4the drawings there is shown the valve corner of a multi-wall sewed bag 6 of the gusset type and in Figure 2 one side wall of the bag is bent outwardly to show the valve 'l which extends inwardly beyond the gusset 8.

A sleeve Ill is inserted in the valve and projects inwardly a substantial distance beyond the inner end of the valve and the upper edge of the side members of the sleeve are caught in the seam 9 which connects the upper ends of vadapted to be folded one on the other on a fold.

line spaced substantially equal distances from the ends of the section of material. The section of material has therein a slit II along said fold line and the ends of this slit are spaced relatively short distances from the respective lateral edges of the section of material, which edges extend transversely to the slit. At that lateral edge of the section of material which constitutes the end of the inserted sleeve which is to be secured to the valve, that is, the outer end, the end of the slit is spaced from said edge of the section of material a distance sufficient to enable aline of paste to extend across the material between the end of the slit and the edge of the section, as shown at l2, for attaching the sleeve to the valve. Y, The other end of the slit is spaced from the other lateral edge of the section, which constitutes the inner end of the inserted sleeve, a distance such that only a very narrow portion of the material lies between the end of the slit and the edge of the section of material, as shown at I3, and this narrow portion of the material is easily broken after the sleeve has been inserted. Often the insertion of the filling spout in the valve Will break this narrow portion ofthe sleeve material and thus disconnect the two sides of the sleeve at the inner corner thereof. If this portion of the sleeve is not broken by the filling spout the action of the material in the lled bag thereon will break the same, so as to permit the inner ends of the sleeve to move with relation one to the other.

The sleeve may be formed in any suitable manner. Preferably it is formed by the mechanism shown in the above mentioned patent, but not here shown, in which a web of material is drawn from a roll, a line of paste is applied to that side of the web which is outermost in the folded sleeve and adjacent that edge of the material which, in the folded sleeve, is to be attached to the valve. The moving web is slit at predetermined intervals transversely to its length by suitable cutters and successive sleeve sections are severed from the web. Each sleeve section is engaged along the line of the slit by a blade-like inserting element, such as that shown at I4 in Fig. 5, which moves the severed section through the space between two xed members to fold the two ends thereof about the edge of the inserting element, which then carries the Yweb into the valve. Due to the fact that the slit terminates in spaced relation to the lateral edges of the section, the section is provided with continuouslateral edge portions which the inserting element engages and which properly position the section on the inserting element and enable the same to be supported thereon during the folding and inserting operation. If the slit extended entirely through either lateral edge of the section, the section could not be properly supported on the blade because of its very narrow contact with the blade at the other end of the slit. Thus the construction of this sleeve enables the sleeves to be mechanically inserted in the valves accurately and in rapid succession.

While we have shown and described one embodiment of our invention we wish it to be understood that we do not desire to be limited to the ydetails thereof as various modifications may occur to a person skilled in the art.

Having now fully described our invention what we claim as new and desire to secure by Letters Patent is:

1. In a bag having a part folded inwardly to form a valve, a sleeve for said valve comprising a section of sleeve forming material folded upon itself and supported in said valve with the fold line thereof adjacent to and substantially parallel with the fold line of said Valve, and with the major portion thereof extending inwardly beyond said valve, said sleeve having a slit adjacent to and extending lengthwise of said fold line from the inner end of said valve to` a point adjacent to and narrowly spaced from the inner end of said sleeve t0 provide a weak connection between the inner edge portions of said sleeve which is easily broken to release said end portions of said sleeve for relative movement.

2. In a bag having a part folded inwardly to form a valve, a sleeve for said valve comprising a substantially rectangular section of sleeve forming material having therein a transverse slit spaced substantially equal distances from two parallel edges of said section, said section of material being folded upon itself substantially on the' line of said slit, one end portion of said folded section being supported in and adhered to the inner end portion of said valve and the other end portion thereof extending inwardly beyond said valve, the ends of said slit being spaced relatively short distances from the respective ends of said folded section of material, and the material between the inner end of said folded section and the adjacent end of said slit being of such narrow width that the connection between the inner end portions of said section of material is easily broken after said section has been inserted in and adhered to said valve.

HARRY PETERS.

CLYDE D. PIERSON.

REFERENCES CITED The following references are of record in th file of this patent: v

UNTED STATES PATENTS Number Name Date 946,318 Bates Jan. 1l, 1910 2,040,336 Rosmait May 12, 1936 2,189,847 Verwys Feb. 13, 1940 

